Here's a circumbinary (Yes, you heard me correct, it took me like an hour or two to get this stable and low eccentricity orbits) system, 4 planets total, one of which is habitable, and one is a gas giant.

Here's a circumbinary (Yes, you heard me correct, it took me like an hour or two to get this stable and low eccentricity orbits) system, 4 planets total, one of which is habitable, and one is a gas giant.

Here's a circumbinary (Yes, you heard me correct, it took me like an hour or two to get this stable and low eccentricity orbits) system, 4 planets total, one of which is habitable, and one is a gas giant.

Here's a circumbinary (Yes, you heard me correct, it took me like an hour or two to get this stable and low eccentricity orbits) system, 4 planets total, one of which is habitable, and one is a gas giant.

I present, The Alberon System! The first image shows the main planet, Alberon A, which is roughly two and a half times larger than Earth with small seas and large desserts. It also has an unusually similar atmosphere to Earth and has a surface pressure of about 1.45 atm, but has a gravity of about 73 m/s^2 (about 7 times Earth's gravity). The second image shows Alberon B, a large moon roughly 1,200km with large oceans. The Moon has an atmospheric mass of about 57 kPa and a surface gravity of about 1.5 m/s^2. Alberon A's rings are a mixture of Ice (shown in white) and an odd brown material of which we cannot match to any known element.I will add a download to the system after I finish tweaking it a bit.

Here's a circumbinary (Yes, you heard me correct, it took me like an hour or two to get this stable and low eccentricity orbits) system, 4 planets total, one of which is habitable, and one is a gas giant.

Here's a circumbinary (Yes, you heard me correct, it took me like an hour or two to get this stable and low eccentricity orbits) system, 4 planets total, one of which is habitable, and one is a gas giant.

How do you make your system stable?

It's all trial and error, trying out different velocities, etc. and that's why it took so long to make.

I present to you, a fully loaded quadruple star system, one star just over 1 and a half times the sun's mass, another just under one and three quarters the size of the sun, another, a red dwarf, just over a tenth the mass of our star, and a Y class Brown Dwarf, only 16 and a half times the mass of the largest planet in our solar system, Jupiter. There are 34 planets, 4 of which may be classified as more of "moons" to the brown dwarf. The Red Dwarf system includes a cometary body, and one of the more major stars includes a very close-in asteroid belt. This system includes an astounding 8 habitable planets, equipped with water and suitable temperatures, although a few of these planets have an extremely thin atmosphere.

Unfortunately i can't figure out how to post the screenshots however i can give you details of my system.

1st/2nd PlanetName: MimisakiMass: 0.47 EarthsRadius: 5,140 kilometersHistory/Description: This planet used to be the Atruness's moon. However when it's parent star gained mass it pulled Mimisaki away from Atruness also forcing those two planets under radically elipse orbits that constantly change their places as 1st or 2nd planet.

1st/2nd PlanetName: AtrunessMass: 2 EarthsRadius: 7,915 kilometersHistory/Description: Atruness used to have Mimisaki as a moon. However just like mimisaki it constantly changes places as 1st or 2nd planet.

3rd PlanetName: DirojiMass: 0.55 EarthsRadius: 5,471 kilometersMoons: 2 primary(Diroji ll and Diroji lll) and 4 secondary(Nira, Yachella, Kapellah, and Ressier).Description: Diroji is the only planet able to sustain primitive life. It also holds another lunar system inside it's own.

ExtraName: KapellahMass: 0.0029 MoonsMoon: 1(Ressier)Radius: 288 kilometersHistory/Description: Kapellah formed naturally like Diroji ll and lll. When asteroids like Nira and yachella came to orbit Diroji, an asteroid named Ressier somehow got close to Kapelah and surprisingly begins to have a stable orbit.

4th PlanetName: MorgannaMass: 2.85 MoonsRadius: 1,858 kilometersDescription: This is the only planet that's isolated from anything except a few asteroids since Umivera A and B sucked in asteroids. Morganna somehow survived the ordeal making it an enigmatic planet.

5th and 6th planetsNames: Umivera A and Umivera BMass: Umivera A: 13.3 Earths, Umivera B: 6.34 EarthsRadius: U.A: 37,000 km, U.B: 28,000 kmHistory/Description: Umivera A was all by itself until about 1.7 billion years ago Umivera B came close to it and began a rare close Double system each other. Both are Gas Giants.

7th PlanetName: TinfitMass: ???Radius: ???Description: This planet is probably the most enigmatic of all the planets. No one knows how it survived Umivera A and B's cataclysmic dance. Tinfit might not have formed naturally like the closer planets. What mysteries lie behind it?

Main starName: YeromoMass: 0.71 sunsRadius: 920,000 kmDescription: This is the only star in the Diroji system.

This simulation allows you to see the different orbits of most well known comets. Do note that most of these don't have a dust tail even at perihelion. Lovejoy would most likely to be shown to be crashing in the Sun, re-orbiting itself extremely close to Sun after perihelion, or, less likely, burn up. Comets PANSTARRS - C/2011 L4, ISON - C/2012 S1, and McNaught - C/2006 P1 have estimated approximate semi-major axis or eccentricity.